CVE-2021-4048

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 2.6% (84th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.8%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

An out-of-bounds read flaw was found in the CLARRV, DLARRV, SLARRV, and ZLARRV functions in lapack through version 3.10.0, as also used in OpenBLAS before version 0.3.18. Specially crafted inputs passed to these functions could cause an application using lapack to crash or possibly disclose portions of its memory.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
46
EG Risk 46/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation3% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
2.8%
EPSS %ILE
85th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

December 8, 2021

Last Modified

November 21, 2024

Advisory Details (9)

Auto-updated Jul 20, 2026
Patch available. Sources: github_commit, github_pr.
generic

stegr! call segfault · Issue #873 · JuliaLang/LinearAlgebra.jl · GitHub

https://github.com/JuliaLang/julia/issues/42415
generic

[SECURITY] Fedora 35 Update: lapack-3.10.0-4.fc35 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DROZM4M2QRKSD6FBO4BHSV2QMIRJQPHT/
generic

[SECURITY] Fedora 34 Update: lapack-3.9.0-7.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6QFEVOCUG2UXMVMFMTU4ONJVDEHY2LW2/
github_commit

commit fe497efa0510 (xianyi/OpenBLAS)

Fix landed in xianyi/OpenBLAS commit fe497efa0510 — awaiting tagged release

https://github.com/xianyi/OpenBLAS/commit/fe497efa0510466fd93578aaf9da1ad8ed4edbe7
github_commit

commit ddb0ff535363 (xianyi/OpenBLAS)

Fix landed in xianyi/OpenBLAS commit ddb0ff535363 — awaiting tagged release

https://github.com/xianyi/OpenBLAS/commit/ddb0ff5353637bb5f5ad060c9620e334c143e3d7
github_commit

commit 337b65133df1 (xianyi/OpenBLAS)

Fix landed in xianyi/OpenBLAS commit 337b65133df1 — awaiting tagged release

https://github.com/xianyi/OpenBLAS/commit/337b65133df174796794871b3988cd03426e6d41
github_commit

commit 2be5ee3cca97 (xianyi/OpenBLAS)

Fix landed in xianyi/OpenBLAS commit 2be5ee3cca97 — awaiting tagged release

https://github.com/xianyi/OpenBLAS/commit/2be5ee3cca97a597f2ee2118808a2d5eacea050c
github_pr Patch Available

Fix out of bounds read in slarrv

Patch available: Reference-LAPACK/lapack v3.10.1 (PR #625 merged 2021-10-01)

https://github.com/Reference-LAPACK/lapack/pull/625
github_commit Patch Available

commit 38f3eeee3108 (Reference-LAPACK/lapack)

Patch available: Reference-LAPACK/lapack v3.10.1 (contains commit 38f3eeee3108)

https://github.com/Reference-LAPACK/lapack/commit/38f3eeee3108b18158409ca2a100e6fe03754781

Vendor Advisories for CVE-2021-4048(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatodf4/rook-ceph-rhel9-operator:v4.14.0-712023-11-08redhat
redhatopenblas-0:0.3.15-4.el82022-11-08redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(8 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
lapack3.10.0-1 ... 3.9.0-3+deb11u1 (20 versions)
  • every version on: no fix on record
—
openblas0.3.13+ds-3 ... 0.3.33+ds-3 (52 versions)
  • every version on: no fix on record
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
lapack—
  • every version up to 3.10.0-2: fixed in 3.10.0-2
—
openblas—
  • every version up to 0.3.18+ds-1: fixed in 0.3.18+ds-1
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
lapack—
  • every version up to 3.10.0-2: fixed in 3.10.0-2
—
openblas—
  • every version up to 0.3.18+ds-1: fixed in 0.3.18+ds-1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
lapack—
  • every version up to 3.10.0-2: fixed in 3.10.0-2
—
openblas—
  • every version up to 0.3.18+ds-1: fixed in 0.3.18+ds-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× in last 7d / 29× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 174 total refreshes for this CVE.

  1. 2026-10-10 19:56 UTCEPSS rescore
  2. 2026-10-09 20:04 UTCEPSS rescore
  3. 2026-10-08 16:40 UTCEPSS rescore
  4. 2026-10-07 23:45 UTCEPSS rescore
  5. 2026-10-06 15:14 UTCEPSS rescore
  6. 2026-10-05 17:40 UTCEPSS rescore
  7. 2026-10-03 14:22 UTCEPSS rescore
  8. 2026-10-03 14:22 UTCEPSS rescore
  9. 2026-10-02 16:23 UTCEPSS rescore
  10. 2026-09-30 15:41 UTCEG score recompute
  11. 2026-09-30 15:00 UTCEPSS rescore
  12. 2026-09-29 15:15 UTCEPSS rescore
  13. 2026-09-28 13:47 UTCEPSS rescore
  14. 2026-09-26 15:54 UTCEPSS rescore
  15. 2026-09-26 00:21 UTCEPSS rescore
  16. 2026-09-25 10:36 UTCOSV refresh
  17. 2026-09-23 13:45 UTCEPSS rescore
  18. 2026-09-22 14:44 UTCEPSS rescore
  19. 2026-09-21 20:28 UTCEPSS rescore
  20. 2026-09-20 20:13 UTCEPSS rescore
  21. 2026-09-19 15:38 UTCEPSS rescore
  22. 2026-09-18 19:24 UTCEPSS rescore
  23. 2026-09-17 19:23 UTCEPSS rescore
  24. 2026-09-16 14:05 UTCEPSS rescore
  25. 2026-09-16 14:05 UTCEPSS rescore
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  1. 2026-09-15 03:06 UTCEPSS rescore
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  3. 2026-09-11 14:49 UTCEPSS rescore
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  5. 2026-09-08 21:57 UTCEPSS rescore
  6. 2026-09-07 15:58 UTCEPSS rescore
  7. 2026-09-06 13:45 UTCEPSS rescore
  8. 2026-09-06 02:00 UTCOSV refresh
  9. 2026-09-05 15:25 UTCEPSS rescore
  10. 2026-09-04 13:57 UTCEPSS rescore
  11. 2026-09-04 05:03 UTCEPSS rescore
  12. 2026-09-02 14:09 UTCEPSS rescore
  13. 2026-09-01 13:51 UTCEPSS rescore
  14. 2026-08-30 19:14 UTCEPSS rescore
  15. 2026-08-30 01:19 UTCEPSS rescore
  16. 2026-08-28 21:38 UTCEPSS rescore
  17. 2026-08-27 14:22 UTCEPSS rescore
  18. 2026-08-26 14:43 UTCEPSS rescore
  19. 2026-08-25 13:46 UTCEPSS rescore
  20. 2026-08-24 14:13 UTCEPSS rescore
  21. 2026-08-21 23:46 UTCEPSS rescore
  22. 2026-08-20 22:52 UTCEPSS rescore
  23. 2026-08-19 17:01 UTCEPSS rescore
  24. 2026-08-19 13:02 UTCOSV refresh
  25. 2026-08-18 13:45 UTCEPSS rescore
  26. 2026-08-17 13:44 UTCEPSS rescore
  27. 2026-08-16 14:53 UTCEPSS rescore
  28. 2026-08-16 02:11 UTCEPSS rescore
  29. 2026-08-15 01:27 UTCEPSS rescore
  30. 2026-08-13 21:57 UTCEPSS rescore
  31. 2026-08-12 13:48 UTCEPSS rescore
  32. 2026-08-11 13:38 UTCEPSS rescore
  33. 2026-08-08 16:34 UTCEPSS rescore
  34. 2026-08-07 16:24 UTCEPSS rescore
  35. 2026-08-06 13:44 UTCEPSS rescore
  36. 2026-08-05 19:15 UTCEPSS rescore
  37. 2026-08-04 15:06 UTCEPSS rescore
  38. 2026-08-04 10:34 UTCEPSS rescore
  39. 2026-08-04 08:57 UTCOSV refresh
  40. 2026-08-03 10:33 UTCEPSS rescore
  41. 2026-08-02 02:24 UTCEPSS rescore
  42. 2026-08-01 04:13 UTCEPSS rescore
  43. 2026-07-30 16:25 UTCEPSS rescore
  44. 2026-07-30 01:28 UTCEPSS rescore
  45. 2026-07-28 15:33 UTCEPSS rescore
  46. 2026-07-26 14:52 UTCEPSS rescore
  47. 2026-07-25 14:15 UTCEPSS rescore
  48. 2026-07-24 14:15 UTCEPSS rescore
  49. 2026-07-24 14:15 UTCEPSS rescore
  50. 2026-07-23 14:16 UTCEPSS rescore
  51. 2026-07-23 02:04 UTCEG score recompute
  52. 2026-07-22 22:50 UTCEG score recompute
  53. 2026-07-22 14:06 UTCEPSS rescore
  54. 2026-07-21 15:22 UTCEPSS rescore
  55. 2026-07-21 15:22 UTCEPSS rescore
  56. 2026-07-20 17:05 UTCEPSS rescore
  57. 2026-07-19 14:29 UTCEPSS rescore
  58. 2026-07-19 02:27 UTCEPSS rescore
  59. 2026-07-19 02:27 UTCEPSS rescore
  60. 2026-07-18 10:02 UTCEPSS rescore
  61. 2026-07-18 05:59 UTCOSV refresh
  62. 2026-07-16 17:00 UTCEPSS rescore
  63. 2026-07-16 17:00 UTCEPSS rescore
  64. 2026-07-15 16:55 UTCEPSS rescore
  65. 2026-07-15 01:58 UTCEPSS rescore
  66. 2026-07-15 01:58 UTCEPSS rescore
  67. 2026-07-13 22:27 UTCEPSS rescore
  68. 2026-07-12 05:44 UTCEPSS rescore
  69. 2026-07-11 08:25 UTCEPSS rescore
  70. 2026-07-09 19:07 UTCEPSS rescore
  71. 2026-07-09 19:07 UTCEPSS rescore
  72. 2026-07-08 15:12 UTCEPSS rescore
  73. 2026-07-08 15:12 UTCEPSS rescore
  74. 2026-07-07 13:43 UTCEPSS rescore
  75. 2026-07-06 16:25 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2021-4048?
CVE-2021-4048 is a critical vulnerability published on December 8, 2021. An out-of-bounds read flaw was found in the CLARRV, DLARRV, SLARRV, and ZLARRV functions in lapack through version 3.10.0, as also used in OpenBLAS before version 0.3.18. Specially crafted inputs passed to these functions could cause an application using lapack to crash or possibly disclose…
When was CVE-2021-4048 disclosed?
CVE-2021-4048 was first published on December 8, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-4048 actively exploited?
CVE-2021-4048 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.8% probability of exploitation in the next 30 days (85th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-4048?
CVE-2021-4048 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2021-4048?
A fix for CVE-2021-4048 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2021-4048 are linked in the Vendor Advisories panel on this page.

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